EP1557651B1 - Dispositif et méthode de contrôle du niveau d'un liquide contenu dans un appareil électroménager - Google Patents

Dispositif et méthode de contrôle du niveau d'un liquide contenu dans un appareil électroménager Download PDF

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Publication number
EP1557651B1
EP1557651B1 EP04026360.0A EP04026360A EP1557651B1 EP 1557651 B1 EP1557651 B1 EP 1557651B1 EP 04026360 A EP04026360 A EP 04026360A EP 1557651 B1 EP1557651 B1 EP 1557651B1
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EP
European Patent Office
Prior art keywords
light
light guide
level
liquid
measuring device
Prior art date
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EP04026360.0A
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German (de)
English (en)
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EP1557651A1 (fr
Inventor
Winfried Steiner
Rolf Stahlmann
Stefan Füglein
Klaus-Martin Forst
Christian Daume
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Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
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Priority to PL04026360T priority Critical patent/PL1557651T3/pl
Publication of EP1557651A1 publication Critical patent/EP1557651A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet

Definitions

  • the invention relates to a device for monitoring at least one liquid level in a liquid-conducting household appliance according to the preamble of claim 1 and a method for level monitoring according to the preamble of claim 19.
  • a liquid-conducting household appliance of this type usually comprises a work area, a domestic dishwasher, for example, a washing container in which dishes to be cleaned is brought into contact with circulating in the household appliance working fluid, and a device sump in which collects the working fluid before being promoted again by the household appliance or discharged from the household appliance.
  • a domestic dishwasher for example, a washing container in which dishes to be cleaned is brought into contact with circulating in the household appliance working fluid
  • a device sump in which collects the working fluid before being promoted again by the household appliance or discharged from the household appliance.
  • the work area is usually followed by a screening system on which the solid components of the impurities from the circulated working fluid are deposited.
  • the amount of circulating in the device working fluid is set in a predetermined range, which usually takes place on the working fluid level in the sump.
  • a maximum or a minimum working fluid level in the sump should not be exceeded or undershot. Too low a level of working fluid in the body of the sump, for example, may result in, among other things, a reduction in the hydraulic power of the circulation pump and a poor cleaning result.
  • a maximum working level in the unit sump or a maximum amount of working fluid in the unit should not be exceeded in order to keep water consumption low, for example, and to enable the screen system to function smoothly.
  • Out EP 0 546 434 A1 is a level control for the liquid level in a dishwasher with an arranged under the bottom of the washing container drain pan, which is associated with a sieve assembly known.
  • the screen assembly is at least partially disposed at the bottom of the washing compartment.
  • a program-controlled circulation pump for the liquid is connected via a suction opening. If necessary, water can be fed into the washing container or into the drain pan via an inlet valve when the circulating pump is running. If the level of working fluid in the drain pan falls below the minimum working level, the inlet valve is opened and water is supplied until the upper working level is reached.
  • the determination of the working level by means of a level sensor on the drain pan.
  • the level sensor includes an airfall chamber disposed in the side wall of the drain pan, which is open below the minimum working level and to which a pressure switch is connected, the switching means of which is coupled to the water inlet valve.
  • level sensor with air trap chamber and pressure switch has a relative high switching hysteresis and relatively large system tolerances, so that the accuracy of the measurement is limited. If the reset level of the level sensor is used to control draining of the drain pan, then the monitored level is typically too high to indicate complete draining. Furthermore, the mechanical components of the pressure switch are subject to wear, which can also have a negative effect on the measurement accuracy over time.
  • WO 01/22862 A1 is a water-conducting household appliance disclosed in the liquid container at least one security level is detected by a security device, which is designed as an optical light guide system for reflecting a light beam.
  • the level is detected by means of a change in the reflection behavior at at least one reflecting point and used, for example, to monitor a complete emptying of the container, a predetermined working level and a maximum filling level.
  • the optical light guide system comprises for this purpose a dipstick, which can be placed on the bottom of the container, and two arranged on this, prism-shaped reflection body for monitoring the Gremonys and preferably two optical sensors, which are attached to the prism bodies.
  • a screening system as in the in EP 0 546 434 A1 described dishwashing machine, it may deteriorate by increasing loading of the screen system with the retained from the working fluid impurities, the flowability of the screens. This then leads to more and more working fluid accumulating in front of the sieve system and consequently the level of working fluid in the sump or in the drain pan drops. With a very high sieve load finally hardly penetrates water through the sieve.
  • a liquid feed is triggered in the household appliance until a predetermined upper working level is reached, although theoretically enough working fluid would be present in the circulation in a caused by loaded sieves working fluid shortage in the appliance sump. This can result in an increased fluid consumption, in very heavily soiled screens even overfilling of the household appliance.
  • an optical fluid sensor is provided as the overflow safety device for the purge tank.
  • the liquid sensor comprises a light emitter, light receiver and transparent, prismatic reflection body.
  • the reflection body is arranged at the level of the safety level for the washing container.
  • the spray arm inflow pipe thus acts as a communicating tube when the pump is switched off.
  • a sieve system is provided at the bottom of the washing container.
  • a device for treating objects with a liquid is described.
  • the transport of the liquid is controlled by valves and optical sensors.
  • the optical sensors include light sources, optical fibers and detectors.
  • An optical fiber encloses an elongated core having a plurality of grooves along its longitudinal direction.
  • a jacket in turn surrounds the core with the light guide.
  • At an upper end of the light guide is a light source and a detector.
  • the jacket includes projections that are complementary to the grooves. By immersing in liquid, the projections are pressed into the grooves and deforms the light guide. The level of the liquid level thus influences the optical properties of the light guide, which are detected by the detector.
  • a liquid container for a dishwasher is known.
  • the liquid container has a closure element with a transparent cone which penetrates vertically into the liquid. The level of the liquid level in the liquid container can be seen by looking at the closure element from the outside.
  • the optical level-measuring device comprises at least one light guide and at least one light source and at least one light receiver, the optical level-measuring device being arranged partly in the direction of circulation in front of the screening system and partly in the direction of circulation downstream of the screening system, and wherein the optical level-measuring device passes through the screening system is.
  • optical level measuring device refers to the parts of the device for monitoring at least one liquid level or liquid level, which are used for detecting the liquid level.
  • the recirculation direction of the working fluid is the main flow direction of the funded during operation by the household appliance liquid.
  • the indication in the direction of circulation before the screening system or after the screening system is therefore also described below in the direction of flow before the screening system or in the direction of flow after the screening system (or simply: before the screening system or after the screening system).
  • the indication in the direction of circulation in front of the screening system or according to the screening system refers in each case to the corresponding area adjacent to the screening system in the circulation circle before or after the screening system, for example by a container adjacent to or accommodating the screening system (eg washing container, drain pan) or Container area can be formed.
  • An idea on which the invention is based is therefore to utilize the advantages of an optical level measuring device and to detect liquid levels before and after the screening system by means of a suitable optical level measuring device in order to better control interference quantities such as, for example, a critical screen loading and which are most advantageous in the respective case Be able to initiate measures for the elimination of the disturbance.
  • the device according to the invention comprises at least one - in the ideal case only one single - optical level measuring device, with which several liquid levels can be detected.
  • optical level measuring device can then be, for example, in the direction of circulation after the screen system a minimum and a maximum working fluid level and optionally a complete emptying and at the same time before the screen system capture at least a predetermined level of safety of the working fluid.
  • the main advantage of the device according to the invention is that a critical Siebbeladung can be detected in time, so that overfilling of the device is substantially excluded by this disturbance and also water can be saved.
  • measures can be taken which lead to a reduction of the sieve loading. These may include, for example, backwashing the screens or requesting manual cleaning of the screen system via a display.
  • the device according to the invention may also comprise a plurality of optical level measuring devices.
  • a separate optical level measuring device for monitoring a complete emptying or other levels in the household appliance, for example as overfill protection may be provided.
  • the optical level measuring device comprises at least one light guide and at least one light source and at least one light receiver.
  • the number and height of the detectable levels is freely selectable. So it is possible to detect one or more filling levels independently.
  • the light radiated into the light guide can be almost completely reflected by the outer wall of the light guide, as long as the light guide is surrounded by air or gases. If liquid comes in contact with the light guide, the angle of refraction of the light changes (the light is then preferably deflected into the liquid) and thus also the light intensity detected by the receiver.
  • a suitable geometric design of the light guide it is achieved that light radiated from a light source propagates in the light guide in such a way that it can be reflected or refracted at several points on the outer wall of the light guide. Each of these places or areas where light is refracted can then be assigned to a filling level.
  • the predetermined fill levels can then be monitored by way of the intensity of the light reflected in the respective regions or over the entire reflected light intensity. Since a change in the irradiated light intensity can also be determined when no continuous liquid column surrounds the light guide, it is possible with a single light guide to determine both the liquid level in front of the sieve system in the circulation circuit of the household appliance and the liquid level after the sieve system.
  • optical fibers Another advantage of using optical fibers is that the hysteresis can be kept in very small areas ( ⁇ 0.2 mbar). Furthermore, the connection of the arranged in the rinsing container optical level measuring device, for example, to an evaluation, very easy to implement. The use of such an optical level measuring device can therefore be very cost-effective compared to other sensors, especially if no further sensors for level measurement are required.
  • the optical level-measuring device is arranged partly in the direction of circulation in front of the screening system and partly in the direction of circulation downstream of the screening system.
  • the optical level measuring device may also be performed by the screen system.
  • the optical level gauge is constructed and arranged to pass through the screen system and monitor both at least one level ahead of the screen system and at least one level downstream of the screen system.
  • liquid levels can then be detected by skillfully introducing and passing the light into or through the light guide before and after the sieve system.
  • the light guide is preferably made of quartz, glass or plastic.
  • plastics polymethyl methacrylate, polycarbonate, polyamide, polystyrene or polyvinyl chloride.
  • the optical waveguide has substantially the shape of a prism or a cylinder.
  • the light guide is then preferably elongated so that it can extend over several filling levels.
  • a cross-sectional area of the optical waveguide changes in size and / or shape perpendicular to a longitudinal axis or longitudinal extent of the optical waveguide in the longitudinal direction. If several filling levels are to be monitored with one light guide, then the light irradiated into the light guide can impinge on different surfaces on the outer wall and be refracted. It may also be particularly preferred if the optical waveguide comprises on its outer surface and / or in its interior at least one means which is intended to reflect and / or deflect an irradiated light beam, in particular at least one protrusion and / or at least one depression and / or or at least one surface and / or at least one insert.
  • the light irradiated in the light guide for example, selectively guided to a level monitoring provided for areas of the light guide and / or then reflected or deflected to the light receiver.
  • a prism used in the light guide can be used.
  • the optical waveguide is essentially helical or helical or helical. Due to the special shape on the outer wall of the optical waveguide, light that has been irradiated into the helix is very frequently refracted or broken and absorbs air or gas surrounded light guide so an approximately zigzag-shaped course in the light guide. If the spiral-shaped optical waveguide is surrounded by a liquid, then only part of the irradiated light reaches the light receiver, the detectable light intensity being approximately proportional to the outer surface of the optical waveguide surrounded by liquid.
  • the optical level measuring device comprises one or more light sources and a light receiver for monitoring one or more liquid levels or for continuous monitoring of the liquid level.
  • a plurality of light sources for example light-emitting diodes, used, they can radiate the emitted light at the same location in the light guide, for example, to achieve a high light intensity.
  • the light sources are arranged at different locations on the light guide, so that light can be irradiated at different locations in the light guide and directed by suitable means to the same light receiver.
  • the light intensity detected by the light receiver allows in each case a statement about the liquid levels to be monitored.
  • the optical level measuring device comprises one or more light sources and a plurality of light receivers for monitoring a plurality of liquid levels.
  • Each light receiver is then preferably associated with one or more light sources.
  • the light intensity detected at the light receiver is then as a rule to be assigned to a filling level to be monitored. It can also be associated with a light source a plurality of light receivers, if it proves to be advantageous in this way to detect several filling levels.
  • At least one light receiver is arranged on one side of the light guide, at which the at least one light source irradiates the light into the light guide, and / or at least one light receiver on one side of the light guide, at which the light, on another side of the at least one light source is radiated into the light guide is emitted.
  • the at least one light source and at least one light receiver can be arranged directly next to each other, for example.
  • the light is irradiated on one side into the light guide, is reflected at one or more specific location (s) or area (s) and then exits on the same side of the light guide on which it was irradiated.
  • the light irradiated by the light source can be deflected once or several times in the optical waveguide, so that it emerges from the optical waveguide at another location or side, at or on which it was irradiated.
  • This is the case, for example, with the spiral-shaped light guide.
  • At least one light receiver is arranged at the end or the side or location of the optical waveguide at which the light exit from the optical waveguide is to be expected.
  • the at least one light source and / or the at least one light receiver can be arranged within the light guide or outside the light guide at the light guide, that is, the light guide material may surround the light source and / or the light receiver or connect to this or be arranged at a certain distance from the light source and / or light receiver.
  • the optical level-measuring device comprises at least two optical fibers arranged side by side, each with a different length or longitudinal extent along its longitudinal axis, for detecting different filling levels.
  • the juxtaposed optical fibers are then preferably aligned with their longitudinal axes substantially perpendicular to a working fluid surface.
  • an end face of the respective, for example cylindrical, light guide is inclined from a plane perpendicular to a longitudinal axis of the light guide. Light incident on the opposite end face of the cylinder can then be refracted at the inclined end face and reflected back to a light receiver.
  • the light guides can then be advantageous in the form of a staircase next to each other or adjacent to arrange, with each light guide is assigned a light source and a light receiver in the rule.
  • each light guide is assigned a light source and a light receiver in the rule.
  • results in a "staircase sensor" which may include any number of stages depending on the number of optical fibers.
  • Each level can then be assigned to at least one fill level. For example, particularly long light guides or particularly high steps may be provided, which pass through the sieve system and monitor the liquid level in front of the sieve system or particularly low steps, with the help of which a complete emptying can be detected.
  • the optical level measuring device comprises at least one substantially spirally formed light guide.
  • the light guide is in turn preferably associated with a light source and a light receiver. With the spiral-shaped optical waveguide, a continuous increase or decrease of the working fluid level in the domestic appliance before and / or after the sieve system can be monitored.
  • the optical level-measuring device comprises at least one optical waveguide, which tapers in its longitudinal extent in at least one stage via at least one surface inclined towards the longitudinal axis of the optical waveguide.
  • this light guide is preferably associated with a light source and a light receiver.
  • Each step of the optical waveguide can then preferably be assigned to at least one filling level, since on the surface inclined towards the longitudinal axis, the light radiated in the longitudinal direction into the optical waveguide can be refracted and reflected in a suitable manner onto a light receiver.
  • the optical waveguide tapers at one end to a cross-sectional area zero, that is, an inclined surface to the longitudinal axis forms a substantially conical or pyramidal tip of the light guide. Also this end or the tip can be assigned to a filling level.
  • the at least one light source and / or the at least one light receiver may or may preferably be arranged in the recirculation circuit or outside the recirculation circuit.
  • the advantage of an arrangement outside the Umisselznikes is that the light source and / or the light receiver are in a dry environment and need not be protected separately against ingress of water.
  • optical level-measuring device or the at least one light source and / or the at least one light receiver and / or the at least one light guide are or is performed by a container wall.
  • the light guide may be led out of the circulation circuit together with the light source and / or the light receiver. But it is also possible that the light guide ends at the boundary of the circulation or the container wall. A seal is then preferably provided between the container wall and the at least one light receiver and / or the at least one light source or the optical level measuring device or the optical light guide.
  • the device according to the invention comprises an evaluation unit and / or a display unit.
  • the detected light intensities can then be forwarded to the evaluation unit, which then determines the current fill level (s).
  • the advantageous measures in each case for example, supply or discharge of working fluid or a screen cleaning can be triggered.
  • current operating states in connection with the fluid level can be displayed via the display unit.
  • an optical level-measuring device is arranged in the direction of circulation downstream of the screening system in a drain pan of the household appliance, which is arranged at the bottom of a washing container of the domestic appliance. It is particularly advantageous if the optical level measuring device in the drain pan, in particular at least one optical waveguide of the optical level measuring device, is at least partially carried out by the sieve system.
  • the at least one optical level-measuring device is then preferably designed such that it monitors at least one safety level of the working fluid in the direction of circulation in front of the screen system and at least one working level and / or a discharge level of the working fluid in the direction of circulation after the screen system. If a spiral optical waveguide is used as the optical waveguide, almost any number of liquid states of the working fluid can be monitored.
  • the liquid household appliance in particular domestic dishwasher, according to claim 27 comprises a circulation circuit, in which a working fluid is circulated, arranged in a Ummélznik sieve system and a device for monitoring at least one liquid level according to one or more of the preceding claims.
  • the light-conducting medium is an optical waveguide, wherein light is irradiated via a light source and the reflected light intensity is detected at a light receiver.
  • liquid is supplied to the circulation circuit until a maximum working level in the direction of circulation is reached after the screening system or when reaching a minimum working level in the direction of circulation after the screening system the liquid is supplied to a maximum working level is reached in the direction of circulation after the screening system.
  • FIG. 1 shows an advantageous embodiment of the device according to the invention in use in a household dishwasher 1 with a partially illustrated washing container 2 and a subsequent to the washing tank 2 drain pan 3.
  • the opening of the drain pan 2 in the washing compartment 1 is covered by a sieve plate 4 of a removable sieve system.
  • the sieve system consists of the sieve plate 4 and a sieve 5, which is placed centrally on the Sieblatte and protrudes into the drain pan 3.
  • the rinsing container 2 and the drain pan 3 form part of the circulation circuit of the household appliance 1.
  • the main flow direction or circulation direction of the working liquid is directed from the rinsing container 2 via the sieve system into the drain pan 3.
  • the working fluid is then returned via a circulating pump (not shown) from the drain pan 3 back into the washing compartment 2.
  • the level measuring device 6 comprises three optical light guides 7 of different lengths, which together form a "staircase sensor".
  • Each optical light guide 7 is a light source 8, preferably a light emitting diode, and a light receiver 9, preferably a photodiode, associated.
  • the light source 8 and the light receiver 9 are each arranged on the same side of the light guide 7 outside of the drain pan 3 (see also FIG. 2 ).
  • the level measuring device, in particular the light guide 7 of the level measuring device is or are guided through the bottom 10 of the drain pan 3 and sealed at the breakthrough against the drain pan 3. This ensures that the electronics of the level gauge are in a dry environment.
  • the light guides 7 are designed as cylinders and each have different longitudinal expansions for monitoring different fluid levels.
  • an end face 12 of the cylindrical light guide 7 inclined from the plane perpendicular to its longitudinal axis A, so that in the light guide 7 incident light can be refracted at these inclined or inclined end faces 12 and reflected back to the light receiver 9.
  • the light source 8 in the direction of the bottom 10 of the drain pan 3 for facing away from the bottom 10 of the drain pan 3 side of the light guide light irradiated into the light guide 7, the light rays 11, 13 pass the light guide 8 in its longitudinal extent and are on the oblique face 12, if it is surrounded by air, almost completely reflected (for example, light beam 11).
  • the light receiver 9 arranged below the bottom 10 of the drain pan 3 then detects the reflected light beams 11.
  • the inclined end face 12 is partially covered by liquid, the light incident on the end face 12 is only partially reflected (in the areas in contact with air, For example, light beam 11) and partially broken or deflected into the liquid (in the areas in contact with liquid, for example light beam 13).
  • the light intensity detected at the light receiver 9 is then lower than the intensity of the almost completely reflected light.
  • the inclined end face 12 is completely covered by liquid, the light impinging on the end face 12 is almost completely refracted into the liquid, so that almost no light arrives at the light receiver 9.
  • a switching point for level monitoring can now serve both the filling height at which the light intensity is greatest, so almost complete reflection, as well as the filling height at which the detected light intensity is the lowest.
  • a liquid level N 1 corresponds to a safety level in front of the screen system for detecting a critical screen load. If the level reaches N 1 , it is signaled that a screen cleaning is required, or initiated a measure for cleaning the screen until the liquid level has fallen back below the inclined end face 12, so the greatest light intensity is achieved.
  • a liquid level N 2 is a maximum working level of the dishwasher. The filling of the household appliance is carried out until the level N 2 is reached. If a minimum working fluid level N 3 is exceeded, then liquid is refilled until the maximum working fluid level N 2 is reached.
  • a liquid level N 4 corresponds to an almost complete emptying of the drain pan 3.
  • FIG. 3 shows a level measuring device 6 with spiral light guide 7.
  • the light is from the light source 8 at one end (end face of the helical cylinder) of the light guide 7 irradiated and repeatedly refracted on the outer wall (cylinder jacket) of the spiral light guide 7 until finally at the other End (opposite end face of the spiral-shaped cylinder) of the light guide 7 meets the light receiver.
  • this level measuring device can be determined over the entire height of the level measuring device 6, the liquid level at each point. If this level measuring device 6 with spiral light guide 7 for the device according to FIG.
  • the light source 8 can be placed in the direction of circulation in front of the screen plate 4 and irradiate light into the light guide, the light receiver 9 can at the other end of the optical waveguide 7 in the direction of circulation after the screening system detect the light intensity radiated there. In this way, the current fluid level before and after the screen system can be monitored in each case.
  • FIG. 4 shows a further advantageous embodiment of a level measuring device 6 for the device according to the invention.
  • the optical waveguide 7 tapers in its longitudinal extent over an inclined surface 14. At each of these oblique surfaces 14 of the light beam 11 radiated from the light source 8 is refracted and depending on whether this surface 14 is wetted or not in the light guide 7 returned to the light receiver 9 (see. FIG. 4 ) or deflected into the liquid (not shown).
  • the level measuring device 6 after FIG. 4 for the device according to FIG. 1 At least the liquid levels N 1 , N 2 , N 3 , N 4 can be monitored.
  • the level measuring device is then performed by the screen plate 4 to determine the liquid level N 1 before the screen system.
  • Further oblique surfaces 14 on the circumference of the light guide 7 could be monitored, for example, more filling levels.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Claims (21)

  1. Dispositif de surveillance d'au moins un niveau de liquide d'un liquide de travail dans un appareil électroménager dans lequel circule un liquide, comprenant
    a) un circuit de circulation dans lequel le liquide de travail est amené à circuler ;
    b) et un système de filtration disposé dans le circuit de circulation, qui se trouve dans une région du circuit de circulation dans laquelle un sens de circulation est dirigé du haut vers le bas,
    c) dans lequel il est prévu au moins un dispositif de mesure optique de niveau (6) pour surveiller au moins un niveau de liquide (N1) en amont du système de filtration dans le sens de circulation et au moins un niveau de liquide (N2, N3, N4) en aval du système de filtration dans le sens de circulation,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) comprend au moins un conducteur de lumière (7) et au moins une source de lumière (8) et au moins un récepteur de lumière (9), dans lequel le dispositif de mesure optique de niveau (6) est disposé en partie en amont du système de filtration dans le sens de circulation et en partie en aval du système de filtration dans le sens de circulation, et dans lequel le dispositif de mesure optique de niveau (6) est mis en oeuvre par l'intermédiaire du système de filtration.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que le conducteur de lumière (7) est constitué de quartz ou de verre ou de matière plastique et présente de préférence sensiblement la forme d'un prisme ou d'un cylindre.
  3. Dispositif selon la revendication 2,
    caractérisé en ce qu'une surface de section transversale du conducteur de lumière (7) présente une taille et/ou une forme variant perpendiculairement à un axe longitudinal (A) du conducteur de lumière (7) dans le sens longitudinale.
  4. Dispositif selon la revendication 2 ou la revendication 3,
    caractérisé en ce que le conducteur de lumière (7) comprend sur sa surface extérieure ou en son intérieur au moins un agent qui est prévu pour réfléchir et/ou dévier un faisceau lumineux injecté, notamment au moins une partie surélevée et/ou au moins un renfoncement et/ou au moins une surface (12, 14) et/ou au moins un insert.
  5. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que le conducteur de lumière (7) est réalisé de manière à présenter sensiblement la forme d'une spirale.
  6. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) comprend une source de lumière (8) ou plusieurs sources de lumière (8) et au moins un récepteur de lumière (9) destiné à surveiller au moins un niveau de liquide.
  7. Dispositif selon la revendication 6,
    caractérisé en ce qu'au moins un récepteur de lumière (9) est disposé sur un côté du conducteur de lumière (7) sur lequel ladite au moins une source de lumière (8) injecte de la lumière dans le conducteur de lumière (7), et/ou
    en ce qu'au moins un récepteur de lumière (9) est disposé sur un côté du conducteur de lumière (7) sur lequel la lumière injectée dans le conducteur de lumière sur un autre côté de l'au moins une source de lumière (8) est émise en sortie.
  8. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que l'au moins une source de lumière (8) et/ou l'au moins un récepteur de lumière (9) sont ou est disposé (s) sur le conducteur de lumière (7), à l'intérieur du conducteur de lumière (7) ou à l'extérieur du conducteur de lumière (7).
  9. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) comprend au moins deux conducteurs optiques (7) disposés côte à côte, présentant des longueurs respectives différentes, pour détecter des niveaux de remplissage différents, dans lequel les guides optiques (7) disposés côte à côte sont de préférence orientés de manière à ce que leurs axes longitudinaux (A) soient sensiblement perpendiculaires à une surface du liquide de travail.
  10. Dispositif selon la revendication 9,
    caractérisé en ce qu'une surface avant (12) du conducteur de lumière (7) constituée d'un plan perpendiculaire à un axe longitudinal (A) du conducteur de lumière (7) est inclinée.
  11. Dispositif selon l'une ou plusieurs des revendications 1 à 8,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) comprend au moins un conducteur de lumière (7) réalisé de manière à présenter sensiblement la forme d'un spirale.
  12. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) comprend au moins un conducteur de lumière (7) qui se rétrécit dans le sens longitudinale en au moins un pas vers au moins une surface (14) inclinée par rapport à l'axe longitudinal (A) du conducteur de lumière.
  13. Dispositif selon l'une ou plusieurs des revendications 9 à 12,
    caractérisé en ce qu'une source de lumière (8) et un récepteur de lumière (9) sont disposés sur chaque conducteur de lumière (7).
  14. Dispositif selon l'une ou plusieurs des revendications précédentes,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) ou l'au moins une source de lumière (8) et/ou l'au moins un récepteur de lumière (9) et/ou l'au moins un conducteur de lumière (7) sont ou est réalisé(s) par l'intermédiaire d'une paroi de récipient, dans lequel il est prévu un élément d'étanchéité entre la paroi de récipient et l'au moins un récepteur de lumière (9) et/ou l'au moins une source de lumière (8) ou le dispositif de mesure de niveau (6) ou le conducteur de lumière optique (7).
  15. Dispositif selon l'une ou plusieurs des revendications précédentes,
    comprenant une unité d'évaluation et/ou une unité d'affichage, notamment un dispositif de mesure optique de niveau (6) qui est disposé en aval du système de filtration dans le sens de circulation dans une cuve de vidange (3) de l'appareil électroménager (1), laquelle cuve est disposée dans une partie inférieure (10) d'une cuve de rinçage (2) de l'appareil électroménager (1).
  16. Dispositif selon la revendication 15,
    caractérisé en ce que le dispositif de mesure optique de niveau (6) se trouvant dans la cuve de vidange (3), notamment au moins un conducteur de lumière optique (7) du dispositif de mesure optique de niveau (6), est réalisé au moins partiellement par l'intermédiaire du système de filtration.
  17. Dispositif selon la revendication 15 ou la revendication 16,
    caractérisé en ce que l'au moins un dispositif de mesure optique de niveau (6) est réalisé de manière à ce qu'il surveille, en amont du système de filtration dans le sens de circulation, au moins un niveau de sécurité (N1) du fluide de travail qui, en aval du système de filtration dans le sens de circulation, au moins un niveau de travail (N2, N3) et/ou un niveau de vidange (N4) du liquide de travail.
  18. Appareil électroménager dans lequel circule un liquide, notamment lave-vaisselle électroménager, comprenant un circuit de circulation dans lequel un liquide de travail est amené à circuler, un système de filtration disposé dans le circuit de circulation et un dispositif destiné à surveiller au moins un niveau du liquide selon l'une ou plusieurs des revendications précédentes.
  19. Procédé de surveillance de niveau dans un appareil électroménager dans lequel circule un liquide, comprenant un circuit de circulation dans lequel un liquide de travail est amené à circuler, et un système de filtration disposé dans le circuit de circulation, dans lequel au moins un niveau de liquide (N1) est déterminé et/ou surveillé en amont du système de filtration dans le sens de circulation et au moins un niveau de liquide (N2, N3, N4) est déterminé et/ou surveillé en aval du système de filtration dans le sens de circulation par mesure et/ou évaluation d'une intensité lumineuse réfléchie dans un milieu conducteur de lumière, caractérisé en ce que le procédé est mis en oeuvre par utilisation du dispositif selon l'une ou plusieurs des revendications précédentes.
  20. Procédé selon la revendication 19,
    dans lequel, au début d'un cycle de travail, un liquide est introduit dans le circuit de circulation jusqu'à ce qu'un niveau de travail maximal (N2) soit atteint en aval du système de filtration dans le sens de circulation, ou lorsqu'un niveau de travail minimal (N3) est atteint en aval du système de filtration dans le sens de circulation, un liquide est introduit dans le circuit de circulation jusqu'à ce qu'un niveau de travail maximal (N2) soit atteint en aval du système de filtration dans le sens de circulation.
  21. Procédé selon la revendication 19 ou la revendication 20,
    dans lequel, lorsqu'un niveau de sécurité (N1) du liquide de travail est atteint en amont du système de filtration dans le sens de circulation, une opération de nettoyage du filtre est déclenchée et/ou un dépassement d'une charge admissible du filtre est affiché.
EP04026360.0A 2004-01-21 2004-11-05 Dispositif et méthode de contrôle du niveau d'un liquide contenu dans un appareil électroménager Active EP1557651B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04026360T PL1557651T3 (pl) 2004-01-21 2004-11-05 Urządzenie i sposób monitorowania poziomu w urządzeniu gospodarstwa domowego z przepływem cieczy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410003077 DE102004003077A1 (de) 2004-01-21 2004-01-21 Vorrichtung und Verfahren zur Niveauüberwachung in einem flüssigkeitsführenden Haushaltsgerät
DE102004003077 2004-01-21

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EP1557651A1 EP1557651A1 (fr) 2005-07-27
EP1557651B1 true EP1557651B1 (fr) 2018-01-10

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DE102007012166B4 (de) * 2007-03-12 2023-06-29 Sanhua Aweco Appliance Systems Gmbh Haushaltsmaschine
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US9192280B2 (en) 2012-12-07 2015-11-24 Electrolux Home Products, Inc. Method and system for detecting and removing a clogging condition of a filter in a dishwasher
US11141039B2 (en) 2017-02-24 2021-10-12 Electrolux Appliances Aktiebolag Dishwasher, method and control system for handling clogging condition

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PL1557651T3 (pl) 2018-07-31
EP1557651A1 (fr) 2005-07-27
DE102004003077A1 (de) 2005-08-11

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